Properties of the Number 156

One Hundred Fifty-Six

Basics

Value: 155 → 156 → 157

Parity: even

Prime: No

Previous Prime: 151

Next Prime: 157

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 2 ² × 3 × 13

Divisors: 1, 2, 3, 4, 6, 12, 13, 26, 39, 52

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011100

Octal: 234

Duodecimal: 110

Hexadecimal: 9c

Square: 24336

Square Root: 12.489995996796797

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

a(n) = n' = arithmetic derivative of n: a(0) = a(1) = 0, a(prime) = 1, a(m·n) = m·a(n) + n·a(m). A3415

Oblong (or promic, pronic, or heteromecic) numbers: a(n) = n*(n+1). A2378

Numbers that are not squarefree. Numbers that are divisible by a square greater than 1. The complement of A005117. A13929

Quarter-squares: a(n) = floor(n/2)*ceiling(n/2). Equivalently, a(n) = floor(n²/4). A2620

Abundant numbers (sum of divisors of m exceeds 2m). A5101

a(n) = prime(n) - 1. A6093

Triangle of coefficients of polynomials u(n,x) jointly generated with A029653; see the Formula section. A208510

Niven (or Harshad, or harshad) numbers: numbers that are divisible by the sum of their digits. A5349

a(n) = 3·n. A8585

Number of simple graphs on n unlabeled nodes. A88

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